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Finding the Fourth Proportional to 1,553.67, 2,330.91 and 687.78

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Solution

The fourth proportional to 1,553.67, 2,330.91 and 687.78 is: 1,031.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,553.67 : 2,330.91 = 687.78 : x
  2. Step 2: Convert to fraction form
    1,553.67/2,330.91 = 687.78/x
  3. Step 3: Cross multiply
    1,553.67x = 2,330.91 × 687.78
  4. Step 4: Simplify right side
    1,553.67x = 1,603,153.28
  5. Step 5: Solve for x
    x = 1,603,153.28/1,553.67
  6. Step 6: Final answer
    x = 1,031.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.